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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Schedule of Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Amortized Cost |  | $ 189,543 | [1] | $ 187,719 | [2]
Gross unrealized gains |  | 1,459 |  | 1,255 |
Gross Unrealized losses |  | (1,710) |  | (788) |
Estimated fair value |  | 189,292 |  | 188,186 |
Accrued interest |  | 776 |  | 781 |
Corporate bonds [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Amortized Cost |  | 161,491 | [1] | 154,577 | [2]
Gross unrealized gains |  | 1,453 |  | 1,207 |
Gross Unrealized losses |  | (1,311) |  | (735) |
Estimated fair value |  | 161,633 |  | 155,049 |
Government bonds [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Amortized Cost |  | 27,332 | [1] | 32,894 | [2]
Gross unrealized gains |  | 1 |  | 37 |
Gross Unrealized losses |  | (399) |  | (53) |
Estimated fair value |  | 26,934 |  | 32,878 |
Municipal bonds [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Amortized Cost | [1] | 472 |  |  |
Gross unrealized gains |  | 0 |  |  |
Gross Unrealized losses |  | 0 |  |  |
Estimated fair value |  | 472 |  |  |
Certificate of deposit [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Amortized Cost |  | 248 | [1] | 248 | [2]
Gross unrealized gains |  | 5 |  | 11 |
Gross Unrealized losses |  | 0 |  | 0 |
Estimated fair value |  | $ 253 |  | $ 259 |
[1] | Excluding accrued interest of $776.
[2] | Excluding accrued interest of $781.

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